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Condensed Matter > Superconductivity
Title: "Quantum bipolaron'' superconductivity from quadratic electron-phonon coupling
(Submitted on 6 Dec 2023 (v1), last revised 8 Apr 2024 (this version, v3))
Abstract: When the electron-phonon coupling is quadratic in the phonon coordinates, electrons can pair to form bipolarons due to phonon zero-point fluctuations, a purely quantum effect. We study superconductivity originating from this pairing mechanism in a minimal model and reveal that, in the strong coupling regime, the critical temperature ($T_c$) is only mildly suppressed by the coupling strength, in stark contrast to the exponential suppression in linearly coupled systems, thus implying higher optimal $T_c$ values. We demonstrate that large coupling constants of this flavor are achieved in known materials such as perovskites, and discuss strategies to realize such superconductivity using superlattices.
Submission history
From: Zhaoyu Han [view email][v1] Wed, 6 Dec 2023 19:00:35 GMT (643kb,D)
[v2] Thu, 21 Dec 2023 04:27:55 GMT (842kb,D)
[v3] Mon, 8 Apr 2024 21:17:16 GMT (848kb,D)
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